Letter-file.



J. L DETTWYLER.

LETTER FILE. Arrmoumu 31mm MAY 1:. 190a.

Patented Jan. 5, 1909.

UNITED STATES PATENT OFFICE.

LETTER-FILE Specification of Letters Patent.

Application filed May 13, 1908.

Patented Jan. 5, 1909.

Serial No. 432,650.

To all whom it may concern:

Be it known that I, J OHANN J AKOB Dn'r'r- WYLER, a citizen of the Swiss Confederation, and resident of Sissach, Switzerland, have invented new and useful Improvements in Letter-Files, of which the following is a specification.

The present invention relates to a letter file with clamping device for the papers, which device opens and closes automatically when the file is being opened or closed.

In the accompanying drawings the invention is shown by way of example Figure 1 represents the letter file in plan; Fig. 2 is a part view of Fig. 1; Fig. 3 is a front view showing the letter file opened; Fig. 4 represents the same partly closed.

The improved letter file is constructed as follows :On the inner surface of the back a of the letter file angle irons b are fixed in proximity of the top and bottom ends of the back (Figs. 1 and 2), the riveted arms of which are directed inwards. These arms serve for gripping the portfolio which has index sheets. To the vertical arms of the angle irons b the ends 2' of the clamping levers (Z are pivoted by means of bolts 0 (see Figs. 1 and 4). The clamping levers cl are bent as shown in Figs. 2 and 4: and provided with studs 6 at each end of the file, to which draw springs f, one for each end of the file, are attached, which pull the clamping levers 03 together, thus securely clamping in the papers which are placed in the file (Fig. 4). In order to obtain a uniform adjusting of the clamping levers at both sides of the file, the bent oif ends 2' of the levers, which are opposite one another, are connected by means of hinged levers g, the one end of which is pivoted to the respective arm 2' by means of a pivot h, the other ends of the two levers 9 being linked together by a pin is which is guided in a slot Z of the vertical shank of angle iron I). At about the middle of each of the two sides of the cover a of the file, a guide piece 12 is fixed which serves for guiding the outer end of a rod m, the inner end of which is attached to the clamping lever (Z. When the file is being opened the clamping levers d are moved away from each other (Fig. 3) and the rods m, the outer ends of which slide in the guide pieces a, assume an approximately vertical position, so that they serve as supports for the clamping levers d.

What I claim is:--

1. An improved letter file with clamping levers for the papers filed, which levers close and open automatically when the file is closed or opened, comprising in combination with said clamping levers rods attached with one end to said levers and guided with the other end in the cover of the file, substantially as described and shown.

2. An improved letter file with clamping levers for the papers filed which levers close and open automatically when the file is closed or opened, comprising in combination with said clamping levers, guide pieces fixed at about the middle of the two sides of the cover of the file, rods, attached with one end to the clamping levers and guided with the other end in said guide piece, substantially as described.

JOHANN JAKOB DETTWYLER.

Witnesses CARL FONER, ARNOLD ZUBER. 

